Chosen Solution
I’ve ordered the MX500 2.5 Inch SSD 250GB for my MacBook Pro ‘13 Mid 2012. Upon installing it into the laptop, renaming and erasing it, I attempted to download the OS, Sierra on to it, (VIA a flashdrive). After the first time it failed mid installation. After the second time it also failed mid installation. This can’t be an issue with my hardware? Because it appears to meet the specs if I’m correct? And the only answer I could see is it being the SSD being defected. My previous failed hardrive I swaped it for was a SATA 5400 RPM, disk drive. 500gbs . so if someone could provide me with some solutions that’d be great?
You’re hitting the classic case of either an old or bad HD SATA cable! You need to get the better cable MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N 923-0104 Follow this IFIXIT guide: MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement Two things you also want to do is place a strip of electricians tape on the uppercase where the cable crosses over to help protect it from the rough aluminum surface. When you bend the cable to go around the corners you want a nice arch not a sharp fold! The cables thin foil wires can be damaged when you bend it to tightly.
